Classifications

• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
  • G01D1/00—Measuring arrangements giving results other than momentary value of variable, of general application
  • G01D1/18—Measuring arrangements giving results other than momentary value of variable, of general application with arrangements for signalling that a predetermined value of an unspecified parameter has been exceeded
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
  • G01D18/00—Testing or calibrating apparatus or arrangements provided for in groups G01D1/00 - G01D15/00
  • G01D18/002—Automatic recalibration
  • G01D18/006—Intermittent recalibration
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
  • G01P13/00—Indicating or recording presence, absence, or direction, of movement

Definitions

• the present invention relates to a proximity detector of the inductive, capacitive, magnetic, photoelectric type or to a mechanical position switch used for controlling rotation, in particular in monitoring under-speed or overspeed of a movement of rotation.
• Detectors for rotation control are frequently used in many industries to control movement, slip, rupture of conveyor belt, rupture of belt, etc.
• they combine conventional functions for detecting the presence of a target close to or in contact with the detector by means of a sensor member and functions for processing by counting the information received by the detector for a given time for comparison with for example a trigger frequency preset on the device, so as to output a binary signal result of this comparison.
• An economical device is thus obtained which is well suited for dealing with simple problems of under-speed or overspeed.
• the document EP 1130403 describes a detector with rotation control, in front of which passes a target whose passage frequency is to be controlled with respect to a normal passage frequency.
• This detector comprises operator dialogue means consisting of a push button and a light-emitting diode LED for dialogue on the detector.
• the push button is used to position the detector in a work mode or in a learning mode.
• the learning mode allows the microcontroller of the detector to measure a normal pass frequency and allows the operating margin of the detector to be selected around this normal frequency.
• the dialog LED associated with the push button is used, for example, to guide the operator in setting the desired operating margin of the detector.
• such a detector also generally comprises a display LED which is the image of the state of the output.
• the invention describes a detector for rotation control delivering a binary output signal and comprising a signaling LED, the state of the binary output signal and the signaling LED being function, in a frequency operating mode, of the frequency of passage of a target in front of the detector.
• the detector is characterized in that it has a static operating mode in which the state of the signaling LED is a function of the distance D between the target and the detector.
• the state of the output signal is, in the static mode, a function of the distance D between the target and the detector.
• the detector comprises a selection member positioned in a first position or in a second position, making it possible to select the static mode and the frequency mode.
• This selection device is also used to configure the learning of the detector in frequency mode.
• the selection member is constituted by a push button whose pressed state corresponds to the second position.
• Figure 1 shows a schematic view of a detector according to the invention
• Figure 2 shows the different modes of operation of the detector.
• a detection device 10 is responsible for monitoring the frequency of passage of one or more targets 20 so as to detect an under speed and / or an overspeed compared to a normal frequency of passage.
• the detection device 10 can either be an inductive, capacitive, magnetic proximity detector or a photoelectric cell controlling the passage of a target located at a distance D from the detector, or a mechanical position switch controlling the passage of a target located in contact with the detector.
• the embodiment presented below corresponds to a proximity detector.
• such a detector 10 comprises a sensor member sensitive to the passage of the target 20 and constituting the information socket of the detector 10.
• the sensor member emits a sensor signal whose state is a function of the distance from the target 20.
• This sensor signal is transmitted, via an amplification and shaping stage, to a processing unit which processes it so as to deliver, through a power stage, a binary output signal 15, can be either in state 0 or in state 1.
• the binary output signal 15 is therefore a function of the frequency of passage of the target in front of the detector, in mode operating frequency.
• the output signal 15 is at state 1 when the frequency of passage of the target 20 is greater than a determined trigger frequency, and at state 0 otherwise, taking into account a hysteresis.
• the output signal 15 is in the state 1 (respectively 0) when the frequency of passage of the target 20 is included within an operating margin around a nominal frequency of determined passage, and at state 0 (respectively 1) outside this margin.
• the detector 10 also includes a signaling LED 16, for example of yellow color, which is traditionally the image of the output 15.
• the detector 10 for rotation control comprises operator dialogue means 11 connected to the microcontroller and which comprise a dialogue LED 12, for example of green color, as well as a selection member 13 positioned in a first position or in a second position.
• the dialogue LED 12 is also frequently used to indicate the supply of the detector.
• the detector for rotation control works according to a frequency operating mode 30 which includes two operating sub-modes: a working mode 31 and a learning mode 32.
• the working mode 31 corresponds to the usual operation of the detector 10 in which the latter monitors the passage of a target 20 and delivers a binary signal 15 as a function of the frequency of passage of this target 20.
• the signaling LED 16 is directly the image of the binary output 15, for example lit when the binary output 15 is in state 1. It can therefore help an operator, placed near the detector, to check the correct functioning of the detector.
• the learning mode 32 makes it possible to configure the detector 10.
• This learning mode comprises for example the following phases:
• the operator uses the selection member 13 and the dialogue LED 12 according to an appropriate dialogue protocol , such as that described in document EP 1130403.
• a first operation is necessary to ensure the correct positioning of the target 20, that is to say to ensure that the distance D between the target 20 and the detector 10 is included in the range of the detector 10, when the target 20 passes in front of the detector 10.
• This adjustment operation is executed during the initial mounting of the detector, when a target 20 is put in place, but also during periodic maintenance operations, etc. If it is carried out with the passage of a rotating target 20, the adjustment operation can become extremely dangerous because of the presence of moving parts close to the operator. It is therefore highly desirable to carry out this adjustment before any operation of the machine on which the detector 10 is fixed.
• the invention describes a detector 10 for rotation control having the possibility of making this adjustment using an additional operating mode, called static mode 35.
• static mode 35 the state of the LED indication 16 is no longer a function of the frequency of passage of this target 20, as in working mode 31, but is only a function of the position of the target 20 relative to the detector 10, that is to say of the distance D between the target 20 and the detector 10.
• the LED 16 is lit only if the distance D between the target 20 and the detector 10 is within the range of the detector 10.
• an operator performing the setting of the detector 10 can directly view information indicating whether the detector 10 (or if the target 20) is correctly positioned, which allows it to quickly complete the setting of the distance D.
• the binary output 15 is generally a function of the distance D between the target 20 and the detector 10, thus behaving like the display LED 16, but can also remain a function of the frequency of passage of the target 20 , as in the frequency mode 30.
• the static mode 35 is then similar to the operating mode of a conventional proximity detector not operating as a rotation controller.
• the static mode 35 also makes it possible to check at any time, at the end of manufacture but also on site, that the detector 10 does indeed exhibit hysteresis on the range detection.
• This hysteresis is set by the manufacturer and is necessary to minimize any risk of rebound of the sensor member at the time of rising or falling edges of the target presence sensor signal. It is essential to check this hysteresis because, in a use in rotation controller, such rebound would inevitably introduce an error in the counting and therefore generate an output signal 15 from the detector 10 potentially erroneous.
• the operator dialogue means 11 used during the learning mode 32 are also used to select the static mode 35 or the frequency mode 30, without penalizing the functionality of the detector 10. It is therefore very economical to * propose a static mode of adjustment 35 as described above in detectors 10 for rotation control already having a learning mode 32, since no addition of additional components is then necessary. This provides an appreciable additional service for the operator to help him set up his installation.
• the selection member 13 makes it possible to select the static mode 35 in the following manner:
• the frequency mode 30 (including the work mode 31 and the learning mode 32) is selected, - if l selection member 13 of the detector 10 is positioned in the second position when the detector 10 is energized, the static mode 35 is selected.
• the selection member is constituted by a simple push button 13 placed near the dialogue LED 12, thus retaining a simple solution for the detector 10.
• the first position of the selection member corresponds to the released state, or not activated, of the push button 13 and the second position in the pressed state, or activated, of the push button 13.
• the transition from frequency mode 30 to static mode 35 requires cutting off the supply to the detector 10, then pressing the push-button 13 and re-supplying the detector 10.
• the passage of the static mode 35 in frequency mode 30 requires cutting off the supply to the detector 10, then re-supplying the detector 10 without pressing the push button 13.
• the pushbutton 13 no longer has any influence for returning to frequency mode 30 or static mode 35, as long as the supply to the detector 10 is not cut. Thanks to the use of a push button, a cut in the power supply to the detector 10 during normal operation places the default detector automatically in the frequency mode 30 corresponding to normal operation, since the push button 13 is by default in a relaxed position.
• the selection member 13 is constituted by a bistable switch with two positions.
• a proximity detector is obtained which has two distinct operating modes which can be used interchangeably: if the switch is positioned at power-up in a first position, the detector operates in frequency mode like a rotation controller with an output. whose state is a function of the frequency of passage of a target, if the switch is positioned at power-up in a second position, the detector operates in static mode like a conventional proximity detector, with an output whose state is a function of the position of a target.

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Geophysics And Detection Of Objects (AREA)
• Testing Or Calibration Of Command Recording Devices (AREA)
• Transmission And Conversion Of Sensor Element Output (AREA)

Applications Claiming Priority (3)

Publications (2)

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• 2001
  • 2001-11-26 FR FR0115465A patent/FR2832797B1/fr not_active Expired - Lifetime
• 2002
  • 2002-11-20 EP EP02799084A patent/EP1448955B1/de not_active Expired - Lifetime
  • 2002-11-20 ES ES02799084T patent/ES2291532T3/es not_active Expired - Lifetime
  • 2002-11-20 JP JP2003547878A patent/JP2005510700A/ja active Pending
  • 2002-11-20 DE DE60222010T patent/DE60222010T2/de not_active Expired - Lifetime
  • 2002-11-20 AU AU2002364310A patent/AU2002364310A1/en not_active Abandoned
  • 2002-11-20 US US10/495,440 patent/US7073381B2/en not_active Expired - Lifetime
  • 2002-11-20 WO PCT/FR2002/003959 patent/WO2003046484A2/fr not_active Ceased
  • 2002-11-20 CN CNB028264703A patent/CN1302261C/zh not_active Expired - Lifetime

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